Chauvin Arnoux C.A 6549 Mode D'emploi page 76

q Connection diagram for measurement of low insulation values (example of a motor)
To measure high insulation values (> 1 GΩ Ω Ω Ω Ω ), we recommend using guard terminal «G» to avoid
leakage and capacitive effects or eliminate the influence of superficial leakage currents. The guard
terminal is connected to a surface where superficial currents may circulate through dust and humidity,
e.g. the insulation surface of a cable or transformer, between two measurement points.
q Connection diagram for measurement of high insulation values
a) Example of a motor (reduction of capacitive effects)
b) Example of a cable (reduction of superficial leakage effects)
§
Unless the step function mode is selected (« Adj. Step »), select the measurement mode to be used
(Manual Stop, Manual Stop +DD, Timed Run, Timed Run +DD, DARor PI) by pressing the MODE key (cf.
§ 4.1)
§
A press on START/STOP triggers the measurement.
If the voltage present is greater than the maximum allowed value, the measurement will be disabled
(see §3.2).
The DISPLAY key can be used to consult all information available during the measurement.
This information depends on the measurement mode selected (cf. § 4.2).
If the insulation values displayed are very unstable, a digital filter can be activated by pressing SMOOTH
to smooth them (cf. § 4.4).
The alarm mode can be activated by pressing ALARM . An audible beep will sound if the measurement
result is below the value defined in SET-UP (cf. § 4.5).
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